Question: How much was pledged to the UNEP by The Everglades: River of Grass author's country of citizenship?
Context: Document 1: The Everglades: River of Grass: The Everglades: River of Grass is a non-fiction book written by Marjory Stoneman Douglas in 1947. Published the same year as the formal opening of Everglades National Park, the book was a call to attention about the degrading quality of life in the Everglades and remains an influential book on nature conservation as well as a reference for information on South Florida. It was used as recently as 2007 by "The New York Times".
Document 2: United Nations Environment Programme: The need of the developing laws such as the International Labor Organization(ILO), the Food and Agriculture Organization(FAO), and the World Health Organization(WHO), led to the 1972 U.N. Conference on Human Environment(the Stockholm Conference) to tackle the pollution caused by the industrial revolution during the 1960s and 1970s. In this conference, various topics including marine life, protection of resources, environment change, disasters related to nature, and biological change were discussed.  This conference resulted in a Declaration on the Human Environment (Stockholm Declaration) and the establishment of an environmental management body, which later was named United Nations Environment Program(UNEP). UNEP was established by General Assembly Resolution 2997.  Headquarters were established in Nairobi and Kenya with a staff of 300, including 100 professionals in a variety of fields, and with a five-year fund of more than US$100 million. At the time, US$40 million were pledged by The United States and the remainder by 50 other nations. The Voluntary Indicative Scale of Contribution (VISC) established in 2002 has the role to increase the supporters of the UNEP. The finances related to all programs of UNEP is voluntarily contributed by U.N. member states. The Environmental Fund, which all nations of UNEP invest in, is the core source of UNEP’ s programs. Between 1974 and 1986 UNEP produced more than 200 technical guidelines or manuals on environment including forest and water management, pest control, pollution monitoring, the relationship between chemical use and health, and management of industry.
Document 3: Marjory Stoneman Douglas: Marjory Stoneman Douglas (April 7, 1890 – May 14, 1998) was an American journalist, author, women's suffrage advocate, and conservationist known for her staunch defense of the Everglades against efforts to drain it and reclaim land for development. Moving to Miami as a young woman to work for "The Miami Herald", she became a freelance writer, producing over one hundred short stories that were published in popular magazines. Her most influential work was the book "" (1947), which redefined the popular conception of the Everglades as a treasured river instead of a worthless swamp. Its impact has been compared to that of Rachel Carson's influential book "Silent Spring" (1962). Her books, stories, and journalism career brought her influence in Miami, enabling her to advance her causes.
Answer: $40 million
Reasoning steps: The Everglades: River of Grass >> author Answer: Marjory Stoneman Douglas
Marjory Stoneman Douglas >> country of citizenship Answer: America
How much was pledged by America ? Answer: $40 million